import java.util.Scanner;
public class Test44 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入您选择的按键服务：");
        int choice = sc.nextInt();
        switch (choice) {
            case 1:
                System.out.println("机票预订");
                break;
            case 2:
                System.out.println("机票改签");
                break;
            default:
                System.out.println("退出服务");
                break;
        }
    }
}
